<?php

/*
 * The MIT License
 *
 * Copyright (c) 2010 http://www.bxdframework.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * Gestore degli eventi
 *
 * @author Fabrizio Filieri
 */
class EventManager
{
	private static $instance = null;

	private $eventsListener;

	private function __construct()
	{
		$this->eventsListener = array();
	}

	/**
	 * Ottiene l'istanza dell'event manager
	 * 
	 * @return EventManager l'istanza dell'event manager
	 */

	public static function getInstance()
	{
		if (self::$instance == null)
			self::$instance = new EventManager();

		return self::$instance;
	}

	/**
	 * Aggiunge un listener ad un evento
	 *
	 * @param string $eventName
	 * @param EventListener $eventListener
	 */

	public function addEventListener($eventName, $eventListener)
	{
		if (!isset($this->eventsListener[$eventName]))
		{
			$this->eventsListener[$eventName] = array();

		}

		$this->eventsListener[$eventName][] = $eventListener;
		
	}

	/*public function removeListener($eventName, $eventListener)
	{
		// not implemented
	}*/

	/**
	 * Genera un nuovo evento, passando i parametri necessari.
	 *
	 * @param string $eventName il nome dell'evento da generare
	 * @param UNK $eventParams i parametri dell'evento. Dipendono dal tipo di evento anche per il formato
	 */

	public function notify($eventName, $eventParams)
	{
		if(isset($this->eventsListener[$eventName]))
			$events = $this->eventsListener[$eventName];
		else
			$events = array();

		//var_dump($events);
		for ($i = 0; $i < count($events); $i++)
		{
			$event = $events[$i];

			$event->onAction($eventParams);
		}
	}
}
?>
